Drafting instrument.



No. 776,713. 7 PATENTED DEC. 6, 1904. M. A. WURTS.

DRAFTING' INSTRUMENT.

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No. 776,718. PAT ENTED DEC. 6, 1904. M. A. WURTS.

DRAPTING INSTRUMENT.

APPLICATION FILED MAR. 30, 1903.

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PATENTED DEC. 6, 1904. M. A. WURTS.

DRAFTING INSTRUMENT.

APPLICATION FILED MAR. 30, 1903.

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Patented December 6, 1904.

PATENT OFFICE.

MAURICE A. WURTS, OF ST. PAUL, MINNESOTA.

DRAFTING INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 776,713, dated December6, 1904.

Application filed March 30, 1903- To all whom it may concern:

Be it known that I, MAURICE A. Wun'rs, a citizen of the United States ofAmerica, and a resident of St. Paul, in the county of Ramsey and Stateof Minnesota, have invented certain new and useful lmprovel'nents inDrafting Instruments, of which the following is a specification.

My invention relates to, improvements in draftinginstruments, its objectbeing to transscribe lines of intersection of cylindrical, eonical, andother shaped bodies. This instrument is particularly adapted for use bysheetmetal workers, and is simple and inexpensive in construction,enables the skilled workman to work more quickly and the unskilled towork with greater accuracy and precision.

To the above ends my invention consists, generically, of a flexible bandadapted to he opened and a series of adjustable ordinal-rods mountedthereon.

In the the accompanying drawings,forming part of this specification,Figure l is a plan View of my invention, showing the ordinalrodsadjusted for use when it is desired to join two pipes. Fig. 2 is a sideelevation of Fig. 1. Fig. 3 isa View of my improved drafting instrument,showing the same opened upon a sheet of material for describing the lineof a joint. Fig. 4 is an end view of Fig. 1. Fig. 5 is a perspectiveview of one of the links of the band, and Fig. 6 is a perspective viewof the connecting-pin.

In the drawings, let A represent the flexible band; B, the ordinal-rods;C, the form for holding the band distended, and D the pipe to which, forconvenience in describing my invention, I have shown the ordinal-rodsadjusted for describing the line of intersection of another pipe.

The band A consists of a series of links 2, which are pivoted togetherby means of the rods 3. The ends 4: and 5 of this band are fastened bymeans of a pin 6, which passes through the loops 7 and 8 on theconnecting ends 1 and 5 of said band. The form C or sleeve correspondsin shape and size to the pipe or body which it is desired to join withthe pipe D, and when used is held at the same angle to the pipe D as thepipe to be connected Serial No. 150,163. (No model.)

is to assume. The band is then fastened around the form, as shown inFig. 1, by inserting the pin 6 through the loops 7 and 8. Theordinal-rods B are parallel, and, as shown, are circular incross-section, though it is obvious that they may be of any suitableshape and made of any suitable material. Clips 9 are riveted at 10 toeach segment. These clips are perforated at 11 for holding theordinal-rods on the periphery of the band. A spring-clip 12 is fastenedto each segment by means of the rivet 13. The spring-clips are providedwith set-screws 1 1, which are adapted to impinge against theordinal-rods and hold them in adjusted position. The ordinalrods may bemarked with scales which indicate degrees and inches for adjusting thedevice at the relative pitch between the two bodies it is desired toconnect. Each ordinalrod is pointed at 21, as shown in Fig. 6, so as toobtain more accurate adjustment of the parts. As shown, the rods 15 and16 are marked at 17 with degrees and the rods 18 and and 19 at 20 withinches.

1 have shown my improved drafting instrument in position for joining twopipes of equal size and at an angle of ninety degrees. The ordinal-rods15 and 16 are adjusted with their points 21 at ninety degrees to thesides of the pipe I), and the rods 18 and 19 are projected equaldistances to meet the surface of said pipe. (See Fig. 1.) Theintermediate ordinalrods are adjusted so that their points touch thesurface of the pipe. 1f the branch pipe is inclined down or up from themain pipe 1), the ordinals-rods 15 and 16 are adjusted so that one rodremains at zero on its scale, while the other is fixed at thedegree-mark corresponding with the angle of the branch pipe. Forexample, if the branch pipe inclines down from the main pipe at an angleof forty-five degrees then the rod 15 is projected and set at 15 on itsscale, while the rod 16 is set at 0. The intermediate rods form as abranch of pipe D. The material is cut on the broken line (indicated at22) which intersects the pointed end of each ordinalrod. It is then cuton said line and formed into a pipe, as in ordinary construction, andjoined with the pipe D. A close-fitting joint between the pipes is theresult.

\Vhen the drafting instrument is adjusted to the pipe D, the pointswhere the ordinalrods touch its surface are marked and the pipe is cutwith a corresponding opening. Said opening conforms with the opening inthe pipe which it is desired to connect with the pipe D.

Different-sized bands are used for differentsized pipes and openings.One or more segments may be removed by withdrawing the connecting-pins 3to decrease the size or additional segments added to increase the sizeof the band.

It is obvious that the flexible band of hinged links andtheirconnections, as described, may be varied in construction or adaptedfor use on different-shaped intersecting bodies and that the means bywhich the rods are fastened to said band may be changed withoutdeparting from the principles which I have applied, and I do not wish toconfine myself to the specific construction specified.

This device may be used for connecting cylinders, cones, and other formsof solid or hollow bodies at any desired angle.

Having described my invention, what I claim as new, and desire toprotect by Letters Patent, is

1. In combination, with a form, an endless band, a plurality ofordinal-rods, a scale by which the position of the ordinal-rods isindicated, a separable connection with said band, and means for holdingsaid rods in parallel position on said band, consisting of a pair ofclips perforated for holding each rod on the periphery of said band, aspring attachment between each pair of clips, and a set-screw in saidattachment adapted to impinge against the ordinal-rod passing throughsaid pair of clips, so as to hold it in adjusted position.

2. A device of the class set forth, consisting of a flexible band, aform for holding said band distended, a plurality of ordinal-rods, and aseparable joint in said band; said band consisting of a plurality oflinks, each link having a pair of clips and a spring attachment forpermitting the ordinal-rod to slide on said link and holding it inadjusted position.

3. A device of the class set forth, consisting of a band A, formed by aseries of links 2, a pivot-rod 3, between each pair of links, aremovable pin for permitting said band to be opened, a sleeve C forholding said band distended, clips 9 on the surface of each link,perforations in said clips, an ordinal-rod passing through each set ofperforations, a spring 12 between each pair of clips, and a set-screwpassing through said spring and impinging against the ordinal-rod forholding the same in adjusted position.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

MAURIOE A. \VURTS.

Witnesses:

E. M. BOESEL, F. G. BRADBURY.

